641129621 has 8 divisors (see below), whose sum is σ = 700000704. Its totient is φ = 582356320.

The previous prime is 641129617. The next prime is 641129639. The reversal of 641129621 is 126921146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641129621 - 2² = 641129617 is a prime.

It is a super-2 number, since 2×641129621² = 822094381847207282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641129221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10376 + ... + 37281.

It is an arithmetic number, because the mean of its divisors is an integer number (87500088).

Almost surely, 2^641129621 is an apocalyptic number.

It is an amenable number.

641129621 is a deficient number, since it is larger than the sum of its proper divisors (58871083).

641129621 is a wasteful number, since it uses less digits than its factorization.

641129621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48891.

The product of its digits is 5184, while the sum is 32.

The square root of 641129621 is about 25320.5375337887. The cubic root of 641129621 is about 862.2805977255.

The spelling of 641129621 in words is "six hundred forty-one million, one hundred twenty-nine thousand, six hundred twenty-one".